I was talking about total deps, not direct. By installing something like Celery, you get 8-10 extra dependencies that, in turn, can also have extra deps. And yeah, extra deps can conflict with each other as well.
That is obviously true but doesn't mean as much as you seem to think. Washing laundry is also not much work but it adds up to a lot over the years, especially if you skip a few weeks of laundry every once in a while. That is not an excuse to not do it.
The answer is the same in both cases: acquire some discipline and treat maintenance with the respect it deserves.
You just keep up as you go, as long as you keep things close to the framework it's fine.